Fuse



June 23, 1925.

1,542,950 E. L. OGLE FUSE Filed Sep. 2, 1921 Patented June 23, 1925.

UNITED STATESy L'PATENT OFFICE.

ELMER L. OGLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO FEDERAL ELECTRIC COMPANY,

' 0F CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

FUSE.

Application filed September To all fwltmn. it may concern.'

Be it known that I, ELMER L. OGLE, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Fuses; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to an overload circuit breaker or, as it is commonly known, an electric fuse and consists of the matters hereinafter described and more particularly pointed out in the appended: claims.

The invention relates especially to the type of fuse described in Letters Patent No. 1,276,800 granted to me on August 27, 1918 and its object is to further simplify and perfect fuses of the kind shown therein.

The advantages and novel features of my improved construction will appear as I proceed with my specification.

In the drawings Figure 1 is a view representing a longitudinal central section through a fuse embodying the novel features of my invention;

Figure 2 is..a transverse section through Fig. l in a plane indicated by the line 2-2 of Fig. 1;

Figure 3 is a transverse section through Fig. 1 in a plane indicated by the line 3--3 of Fig. 1;

Figure 4 is an end view of the removable cartridge of the fuse;

Figure 5 represents perspective views of parts of one end of the cartridge as they appear in the process of assembly; I

Figure 6 is an end view of the parts shown in Fig. 5 as they appear immediately after assembly but before they have been locked together in the manner presently to be described.

Referring now to that embodiment of the invention illustrated in the drawings: 1() indicates the tubular body of the fuse, made of insulating material, and provided at its ends with the metallic ferrules 11, 12. The ferrule 11 is a cap with a closed end and is permanently fixed to the tubular body 10. The ferrule 12 is open at the end so that the cartridge 13 may be inserted into the fuse body, but has a semi-circular, radial, inwardly extending end flange 14, adapted 2, 1921. Serial N0. 497,888.

to engage and overlie the peripheral edge of a closure disc 15 which has a lug 16 ex tending at right angles to it, by means of which it is secured in place by a screw 17 which is threaded into the ferrule.

The features of construction thus far described are substantially as shown in my Letters Patent, hereinabove referred to and require no detailed description.

The cartridge body 13 is closed at the right hand end, as in my former patent, by means of a star washer 18, engaged within the tube adjacent its end and by a metallic flanged cap 19 having its flange clinched against the sides of the `tu]oe,-both the washer and the head of the cap being slotted to permit the extension through them of the fusible member or bar 20. In order,

however, to insure a uniform, definite spacf ing of the star washer from the end of the tubular body of the cartridge so that it may take a substantial grip against` the inside of the tube, I provide a plurality of detents 21 in the head of the cap 19, whichare stamped or punched from the metal of said head so as to project inwardly and away from its inner face. In assembling the struc` ture, the star washer v18 is first inserted in the end of the tube and `the cap 19 is then applied and its head brought against the end of the tube. This forces the washer within the end of the tube a distance equal to the length the detents 21 project beyond the inner face of the head of the cap, so that when the cap is clinched on the tube, a substantial part of the end of the tube is always gripped between the star washer and the head of the cap.

The opposite end of the cartridge tube is closed by a plug 22 to which and end of the fusible member 20 is attached and by a cap 23 clinched on said plug with the end of the cartridge tube gripped between the two. The plug 22 is tapered toward its end (see Fig ures 1 and 5) where it is provided with an annular flange 24. The plug has an inA ternally threaded aperture 25 extending longitudinally through it to receive a screw 26 extending through the head of the closed ferrule 11 which screw acts to lock the cartridge in position as in my former patent. The inner end of the plug has a tubular extension 27, which has one side collapsed wit-hin the opposite side, with the end of the fusible bar gripped between, the parts being soldered together to provide a perinanent con eetion.

The plug 22 has an annular' boss 2S at its outer end and the Cap Q3 has a circular aperture in its head adapted, before assembly, to loosely einbraee said boss. rlhe plug has a longitudinally extending noteh 2*) adapted to be engaged by a pin 30 extending inwardly Vfroin the errule ll, through the body of the ruse in the usual inanner, for preventing rotation olf the cartridge while the screw 26 is being screwed into the plug The annular head ot' the Cap is out away as indie-ated at 3l at a point. corresponding to the location ot said slot in the plug. rl"he Cap 23, originally cylindrieal, is inade large enough to slip easily upon the end of the cart-ridge tube while the plug 22 is designed to lit within the end of said tube. After the two are assembled in this` inanner, with the eut-away part 3l ot the head of the cap, in line with the longitudinal slot 29 in the plug1 the side wall 3l ot' the cap adjacent the notch 29, is loreed into said notch so as to contorni as nearly as inay be to the erossseetion ol said noteh and 'the body ol thel cap is elinehed down against the tapered body of the plug,-the end ot' the tube being gripped between. This causes the aperture in the head to contract and the nietal defining said aperture to grip the boss QS on the outer end ot the plug, and thus securely lool; the cap and plug on the end ol the cartridge tube.

I olailn as iny invention:

l. In an elet-trio luse, a cartridge eontainu ing a fusible elenient, said cartridge eoinprising a tubular body of insulating inaterial, a closure for one end of said body through which said fusible element extends,

a closure and fusible element support for the other end of said body comprising an inwardly tapered, internally threaded, inetal plug, provided with an extension for the attaelnnent of the fusible element, and a tub u lar cap with an apertured head adapted to be elainped upon said plug with the end ot said tubular bod gripped between, said plug having a oss adapted to extend through the aperture in the head of said ap, said plug having a longitudinal notch and said head being out away in line with said notch, and the body of the cap extending' into said notelrso that the inetal of the head is closely engaged with the boss on said plug.

In a cart-ridge for an eleetrie fuse., in Combination with the tubular body thereof, a closure and fusible element support Ylor one end of said cartridge comprising an inwardly tapered internally threaded, inetal plug having a, ss at its outer end und u longitudinal notch on one side, and u tubular nietal cap having an apertured head through whit-h said boss extends, the head being out away in line with the notch in said plug, and the ea being clamped upon said plug with the tu ular body of the eartridge between, and with the tubular wall of theA cap extending into the notch ol the plug.

In testimony that l elaixn the foregoing as niy invention, I atlix my signature in. the presence of two witnesses, this 15th day olf August, A. ll). 192L ELMER L. UG LE.

Wi l nesses CLARENCE E. MERLHOPE, T. H. ALFREDS. 

